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Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes.

Author(s) : FERNÁNDEZ-SEARA J., UHÍA F. J., DIZ R., et al.

Type of article: Article, IJR article

Summary

Heat transfer coefficients (HTCs) for outer condensation of R22 and vapours of its retrofit substitutes R417A, R422A and R422D on 90/10 CuNi Turbo C tubes were experimentally measured. The tubes have 19.05 mm nominal outside diameter, 40 fins per inch (1575 fpm) on the outer surface and a smooth inner surface. The effective condensing length per tube was 1895 mm. Experimental data are reported at vapour saturation temperature of 40°C and wall subcoolings from around 1.5 to 8°C. A rapid increase of the HTCs for low wall subcoolings attributable to the presence of the hydrocarbon in the mixtures was found. For wall subcoolings greater than around 3°C, the condensation HTCs slightly increase with raising the wall subcooling and they are for vapours of R417A, R422A and R422D lower by 65-76, 24-31 and 60-67% than the HTCs for R22, respectively. Comparisons of the condensation performance amongst the different refrigerants and experimental enhancement factors for the condensation of R22 on 90/10 CuNi Turbo C tubes are reported in the paper.

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Pages: pp. 148-157

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Details

  • Original title: Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes.
  • Record ID : 2009-2270
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 33 - n. 1
  • Publication date: 2010/01

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